访问静态内部类的Java可能会抛出NoSuchFieldException

Question

在Java中，为什么调用静态嵌套类将无法编译，因为潜在的NoSuchFieldException和IllegalArgumentEception？

这是我的课程：

public class DBRef {
    public static class CMS_FILE_ROOM extends BuildableDatabaseTable {

        public static String _table_name = "cms_file_ROOM";
        public static BuildableColumn _ALL = new BuildableColumn._ALL(getCurrentClass());

    }


    public static SelectQuery SELECT(final BuildableColumn... columnsToSelect) {
        return new SelectQuery(columnsToSelect);
    }
}

public class SelectQuery extends Query {

    public SelectQuery(final BuildableColumn... columnsToSelect) {
        super();
        for (final BuildableColumn column : columnsToSelect) {
            this.columns.add(column.toSQL());
        }
    }

    public Query FROM(final Class<? extends BuildableDatabaseTable> tableClass) throws NoSuchFieldException, IllegalAccessException {
        this.froms.add(DatabaseAccesser.toSQL(tableClass));
        return this;
    }
}

// Method called in both cases just above by some poor designed methods redirection (my bad). But exceptions are catched.
public static String toSQL(final Class<? extends BuildableDatabaseTable> table) {
    try {
        return (String) table.getField("_table_name").get(null);
    } catch (final IllegalAccessException e) {
        e.printStackTrace();
    } catch (final NoSuchFieldException e) {
        e.printStackTrace();
    }
    return "ERROR";
}

当我从我的代码中的任何其他地方开始：

SelectQuery lSelectQuery = (SelectQuery) DBRef.SELECT(DBRef.CMS_FILE_ROOM._ALL)
            .FROM(DBRef.CMS_FILE_ROOM.class);

我得到以下（编译时）错误（在.class调用上）：

我找不到原因，我可以把它嵌入试试中，但我想了解原因？